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Some software developers always want to set up a certain design pattern when designing programs. In fact, this is wrong and they do not really master the idea of design pattern. In fact, many times readers use a certain design pattern, but they just don't know what the name of this pattern is. Therefore, when designing programs, we should use appropriate design patterns according to our own understanding.※各话1周间限定配信在这个不爱书只爱钱的年代，“深夜书店”能活到今天，实属不易，有好事者分析原因，可能有二：第一，店主老白太帅且有脑，大有妖道风范。第二，上至宋代孤本，下至高考真题，书店藏书保罗万象。凡进过此间书店的人，都像吸了毒一样频频光顾，更有甚者，称其能让人脱胎换骨，重新做人。不过也有流浪汉称，“深夜书店”里的书会吃人，据说还是亲眼所见……等他们处理完一切，回到黎水和青鸾公主藏身的山坳，黎水正急得团团乱转。The Jinning case has a lot to do with the inaction of the local police. If the police had paid a little attention, so many people would not have died.本剧根据王朔的同名小说《一半是火焰，一半是海水》改编。The above code: We use a parameter FN to pass it in, and if there is an instance of result, we will return it directly. Otherwise, the current getInstance function calls FN, and this pointer points to this FN function. After that, the return is saved in the result. Now we can pass a function in, whether it is to create div or iframe. In short, if this is the case, we can use getInstance to get their instance objects.